I would like advice on how to address the high exhaust volume at the top of the rotary membrane deaerator
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Guys, I’m a newbie seeking advice – I recently put into use a membrane deaerator. During operation, there is a large amount of exhaust gas at the top, and the exhaust gas contains water. The opening degree of the exhaust valve is 60%; if it is set lower, the oxygen content in the water becomes unacceptable. The opening degree of the steam inlet valve is 80%; if it is set lower, the pressure inside the deaerator cannot meet the process requirements. I earnestly seek guidance from experienced engineers – where could the problem lie? Thank you very much!
What are the pressure and temperature control settings for your deaerator? 0.02 MPa and 102 degrees Celsius, or 0.58 MPa and 158 degrees Celsius?
It is 0.02 MPa, 104°C – low pressure; currently, steam is directly escaping from the exhaust pipe
Under normal circumstances, the vent at the top of the deaerator should be fully open; otherwise, the local water seal can easily be punctured! Moreover, it seems that the design of your deaerator is too small; under normal circumstances, the valve position of the steam control valve shouldn’t be that large! Another approach is to increase the temperature of your deionized water entering the deaerator, thereby reducing the amount of steam required by the deaerator!
The inlet water temperature is 60-75, which should be quite high already
Most likely, the steam pressure for heating is too high. Determine the pressure before the steam inlet control valve, and then install a pressure reducer to lower that pressure to between 0.2 and 0.3 MPa.
Find the manufacturer and ask them to make adjustments; after all, there is condensation. If there is a large amount of water, and it’s not natural condensation, then there must be some problem. Have the manufacturer fix it. Is it produced by that factory?
How to calculate the exhaust volume of a deaerator,
An inlet water temperature of 60–70 degrees is a bit low; the heat transfer volume is high, so the heating space inside the deaerator must be large enough. In other words, the height of the material layer above the spiral film tubes should be greater, and if necessary, the amount of steam supplied at the secondary steam inlet should be increased.